He may just be dehydrated and thin. I have seen neonates with the big abdomen, probably from birthing with considerable yolk remaining inside. Maybe try increasing the heat and humidity. Not heat alone. That may also be part of the problem.
Spray mist him and the enclosure couple times a day. Bring temp up to about 88 or 90 for a few days. He may eat after a day or so of that regime. Then you can see how well he processes the food. Which may indicate whether he may have Crypto or not.
jsc
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"As hard as I've tried, just can't NOT do this"
John Crickmer

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